Afficher la notice abrégée

Hydraulic and vulnerability segmentations at the leaf-stem interface: Do they exist and are they coordinated across Neotropical trees?

hal.structure.identifierEcologie des forêts de Guyane [ECOFOG]
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
dc.contributor.authorLEVIONNOIS, Sébastien
dc.contributor.authorCALVET, Emma
dc.contributor.authorZIEGLER, Camille
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorCOSTE, Sabrina
dc.contributor.authorSTAHL, C. E.
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
dc.contributor.authorSALMON, Camille
dc.contributor.authorJANSEN, S.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
hal.structure.identifierEcologie des forêts de Guyane [ECOFOG]
dc.contributor.authorHEURET, Patrick
dc.date.conference2019-09-25
dc.description.abstractEnThe hydraulic segmentation hypothesis predicts that hydraulic constriction occurs close to leaves, as “bottlenecks”, in order to preserve lower water potentials, and promote drought-induced embolism containment in easy-to-renew organs. The vulnerability segmentation hypothesis predicts that leaves should be more vulnerable to the drought-induced embolism than stems. These two mechanisms should lead leaves to act as “safety valves” to protect perennials organs. With the increasing issue relative to drought resistance and climate change, the vulnerability segmentation has been intensively investigated in past years, although there is a lack of investigations for Neotropical trees. The hydraulic segmentation is more old-fashion and less investigated. Today, no study has investigated if these two sides of segmentation are related across species. We investigated across 15 Neotropical canopy tree species xylem vulnerability to embolism in stem (Cavi1000 method) and leaves (optical method) to assess an index of vulnerability segmentation. We used theoretical leaf-specific conductivity through an anatomical approach, to assess an index of hydraulic segmentation (Tyree & Ewers 1991). Our objectives were (i) to test the existence of vulnerability and hydraulic segmentations for Neotropical trees, and (ii) to test if these two mechanisms are related or not across species
dc.language.isoen
dc.subject.enHydraulic segmentation
dc.subject.enNeotropical trees
dc.subject.enHydraulic segmentation
dc.title.enHydraulic and vulnerability segmentations at the leaf-stem interface: Do they exist and are they coordinated across Neotropical trees?
dc.typeCommunication dans un congrès
dc.subject.halSciences du Vivant [q-bio]/Biodiversité/Systématique, phylogénie et taxonomie
dc.subject.halSciences du Vivant [q-bio]/Ecologie, Environnement/Ecosystèmes
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale/Botanique
dc.subject.halSciences de l'environnement/Biodiversité et Ecologie
bordeaux.conference.title4rd Xylem International Meeting
bordeaux.countryIT
bordeaux.conference.cityPadua
bordeaux.peerReviewedoui
hal.identifierhal-03023029
hal.version1
hal.invitednon
hal.proceedingsnon
hal.conference.end2019-09-27
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03023029v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=LEVIONNOIS,%20S%C3%A9bastien&CALVET,%20Emma&ZIEGLER,%20Camille&COSTE,%20Sabrina&STAHL,%20C.%20E.&rft.genre=unknown


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée